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Finding the Fourth Proportional to 1,390.92, 2,087.19 and 525.30

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Solution

The fourth proportional to 1,390.92, 2,087.19 and 525.30 is: 788.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,390.92 : 2,087.19 = 525.30 : x
  2. Step 2: Convert to fraction form
    1,390.92/2,087.19 = 525.30/x
  3. Step 3: Cross multiply
    1,390.92x = 2,087.19 × 525.30
  4. Step 4: Simplify right side
    1,390.92x = 1,096,400.91
  5. Step 5: Solve for x
    x = 1,096,400.91/1,390.92
  6. Step 6: Final answer
    x = 788.26

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.